The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

The world's largest fully steerable radio telescope.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

One of few lasting examples of the brief octagon craze that developed into folly.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

The first KFC is on the National Register of Historic Places.

An innovative attempt to break a siege in the American Civil War still scars the earth today.

The blinking light atop the iconic landmark has been sending secret messages for decades.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

Perhaps the most scandalous statue of America's first president.

A throwback train ride transports passengers through one of the lesser-known national parks in the country.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

A 35-foot-tall fork stuck in the ground outside an office building in Missouri.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

These beautiful wineries were at the center of Lake Erie's "grape belt" back when the Midwest dominated American wine production.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.